Formwork for molding concrete columns and the like



Jul 12, 1949. w. HAMILTON 4 FORMWORK FOR MOLDING CONCRETE COLUMNS ANDTHE LIKE Filed Sept. 4, 1946 3v Sheets-Sheet 1 10 10 J F 1 16 F 4:9

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FORMWORK FOR MOLDING CONCRETE COLUMNS AND THE LIKE Filed Sept. 4, 1946 3Sheets-Sheet 2 INKCNTOR MMVLUM w. HAMILTON 2,475,890

FORMWORK'FOR MOLDING CONCRETE COLUMNS AND THE LIKE July 12, 1949.

:5 Shets-Sheet 5 Filed Sept. 4, 1946 QUI INVfiNTOQ waL MMY fi PatentedJuly 12, 1949 FGRMWURK 'FOR MOLDING GGNCRETE COLUIWNS AND LIKEWilliamHamilton, Frimley Green, England Application September 4, 1946,Serial No. 6943763 In Great Britain lune' 11,"194'5 Section 1, PublicLaw 690, August 8,1946 Patent expires June 11, 196'5 This inventionrelates to 'formwork or shutterin such as is used for casting-in situconcrete and like structures and has for its objectto provide formworkfor the casting of columns, a particular object ofthe invention being toprovide standardised parts which enable a variety of sizes of column tobe cast, and which shall provide for the simple erection and assembly ofthe formwork, whilst ensuring that all the parts are firmly securedtogether when in use.

According to this invention, a formwork for moulding concrete and likecolumns comprises external angle-pieces arranged at the corners of theformwork, the limbs of each of which anglepieces-areeach provided withone or more toothed external ledges extending towards an adjacentcorner, one or more toothed locking bars extending across each side ofthe formwork and each engaging a toothed ledge on each .of twoanglepieces, and panels each side of the formwork retained between twoof said angle-pieces.

Internal angled fillets maybe arranged to be supported in .spacedrelationship with said external angle-pieces so as to clamp between themthe edgesof said panels.

A number of angle-pieces may be arranged end to-end, which ends .areprovided with co-operating lugs and sockets..whereby the angle-piecesare aligned.

A number of panels on each side of the formwork may be arranged oneabove the other, and opposite edges of said panels may be recessed sothat adjacent panels may overlap one another While maintaining theirfaces in alignment.

The aforesaid angle-pieces may be provided with projections overlyingsaid ledges and removable locking means may be arranged for insertionbetween said projections and locking bars for maintaining said lockingbars in engagement with the toothed ledges.

The aforesaid angled fillets may be each secured to their co-operatingexternal angle-pieces by bolts arranged diagonally through theirrespective angles to provide for the simultaneous clamping of panelsagainst both limbs of the angle-pieces.

The aforesaid panels may comprise a metal frame surrounding a sheet ofplywood or the like. The following is a description of one embodiment ofthe invention as applied to a formwork for casting a solid column,reference being made to the accompanying drawings in which:

Figure 1 is a side elevation of the general assemblage,

Figure 2 is an enlarged side View of a portion of two angle-piecesarranged end to end showing a locking bar assembled with one of theledges,

Figure 3 is a section on the line 3-3 ofFigureZ,

Figure 4 is a section onthe line '4-4 of Figure 2,

Figure 5 is a face view of one'of'the panels and Figure 6 is a sectionon the line -6-6 of 'Fi ure 5.

It will be assumed, for the sake of clarity, that the column is verticaland the formwork will be described in this setting. The externalanglepieces, are constituted by aluminium angles it which maybe, forexample, of the order of 6 -feet in height and they are provided-on theoutside at each end with lugs H which overlap the outside of the end ofan adjacent angle-iron, thereby ensuring accurate alignment and rigidconnection between the angle-iron. On the outer faces of eachangle-piece there are formed a number of ledges 12 which are spacedapart lengthwise at suitable positions, and these ledges-are "toothed orserrated at 13, for example, with rectangular grooves, which may beabout inch wide and of an inch deep, spaced A; inch apart. Each of thesetoothed surfaces has an overlying ledge l4 facing and spacedaway fromit, the two ledges l2 and 14, for example, constituting a pocketand theyare disposed at their length transverse to the "length of theangle-pieces. Toothed locking bars [5 which are shaped to engage withthe toothed ledges are provided, and these may be of a length of theorder of 2 feet 6 inches, and they can be adjustably engaged towardseach end with two angle-pieces I0 to space them apart by any desireddistance, and also to hold them rigidly when they are spaced by theinterengagement of the bars with the teeth. When the looking bars havebeen assembled in place, they are securely retained therein by means ofwedging pieces l6 which are inserted between the bar and the ledgeopposite to the toothed ledge so as to hold the locking bar againstdisplacement; these wedging pieces are conveniently made in the form ofU-shaped clips which engage the outer surface of the untoothed ledge l4,and means may be provided for retaining them in place, for example, by apin passing through holes I1 in the limbs of the clip and ledge I4.

011 the outer corner of the angle-piece there are provided bosses I8spaced at convenient points along the length, and these bosses aredrilled so that the centre line of the whole bisects the angle betweenthe two limbs of the angle-pieces to permit the insertion of a bolt [9there-through, the threaded end of the bolt extending outside theanglepiece to receive a butterfly nut (not shown) screwed down onto theboss.

Angled fillets 20 are used with each of the angle-pieces and arepreferably made of a light metal alloy, and are curved at 2| on theirinner faces to a suitable curvature which will constitute the mould forthe corner of the concrete column, and these fillets are secured inplace by the diagonal bolts l9 aforesaid which are screwed into thefillet at the corner thereof at 22 so that the external surfaces of thefillet when thus assembled are parallel with the internal surfaces ofthe angle-piece.

There are also provided panels 23 to fill the gap between twoangle-pieces when spaced apart, and these panels are of rectangularoblong form. Their dimensions are so chosen as to provide a suitablerange by setting the panels with their long edges either vertical orhorizontal; thus, for example, the panels may be 8 inches in width and11 inches in length. The edges of these panels are gripped between theangled fillet 20 and the angle-piece l0, and these latter are made ofsuch dimensions as to allow a tolerance of, say, 1 or 2 inches in thedepth to which the panel is inserted between them. When the panels areinserted with their length vertically, that is to say their dimensionsof 8 inches between two anglepieces, and there is a tolerance of 1inches on each angle-piece, a column of 8 inches in width can be formed,or by utilising the 1 inch tolerance on each angle-piece any otherdimension up to 11 inches in width can be achieved. A further range ofwidth from 11 inches to 14 inches can be obtained by inserting thepanels with their length between the angle-pieces so that any width ofcolumn from, say, 9 inches to 15 inches can be obtained with the one setof parts as above described.

The same angle-pieces can be used for larger columns by providing analternative set of panels of which the dimensions may be of the order of14 inches by 17 inches, thereby enabling columns of width up to 21inches to be formed.

In order to provide a rigidity for the different panels when assembledin the angle-pieces, the panels are formed with metal frames 24,preferably a light alloy with a plywood filling, and the 4 metal frameson opposite sides of the panel are recessed at 25 from opposite faces ofthe panel so that when two panels are assembled one above the othertheir edges interlock and ensure a rigid and truly aligned surface forthe mould.

Scaffolding, such as tubular scaffolding, may be used for holding thecolumn in position, and the concrete is poured into the formwork fromthe top of the column. The assembly permits vibration of the concreteand this may be effected by any suitable attachment.

It will be seen that this invention provides a standardized set of partsfor the formwork which includes a wide variety of work to be done andthat the erection and dismantling are very simple, quick and cheap,thereby considerably expediting the work.

I claim:

A formwork for moulding concrete and like columns comprising externalangle-pieces arranged at the corners of the formwork so as to extendalong the height thereof the limbs of each of which angle-pieces hasfixed thereto one or more toothed external ledges extending towards anadjacent corner, and a projection overlying and spaced away from saidledge, one or more locking bars toothed at both ends and extendingacross each side of the formwork and each engaging the toothed ledges oneach of two anglepieces and locking means inserted between each saidoverlying projection and the locking bar beneath it, and panels on eachside of the formwork retained between two of said angle-pieces andunattached to said locking bars.

WILLIAM HAMILTON.

REFERENCES CITED The following referenlces are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 975,615 Hanneman Nov. 15, 19101,318,427 Yamaguchi Oct. 14, 1919 1,670,338 Butterworth May 22, 19281,871,919 Schubert Aug. 16, 1932 1,936,666 Hall Nov. 28, 1933 2,206,493Whatting July 2, 1940

